Light-sensing via hydrogen peroxide and a peroxiredoxin

Kristofer Bodvard, Ken Peeters, Friederike Roger, Natalie Romanov, Aeid Igbaria, Niek Welkenhuysen, Gaël Palais, Wolfgang Reiter, Michel B. Toledano, Mikael Käll, Mikael Molin

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Yeast lacks dedicated photoreceptors; however, blue light still causes pronounced oscillations of the transcription factor Msn2 into and out of the nucleus. Here we show that this poorly understood phenomenon is initiated by a peroxisomal oxidase, which converts light into a hydrogen peroxide (H 2 O 2) signal that is sensed by the peroxiredoxin Tsa1 and transduced to thioredoxin, to counteract PKA-dependent Msn2 phosphorylation. Upon H 2 O 2, the nuclear retention of PKA catalytic subunits, which contributes to delayed Msn2 nuclear concentration, is antagonized in a Tsa1-dependent manner. Conversely, peroxiredoxin hyperoxidation interrupts the H 2 O 2 signal and drives Msn2 oscillations by superimposing on PKA feedback regulation. Our data identify a mechanism by which light could be sensed in all cells lacking dedicated photoreceptors. In particular, the use of H 2 O 2 as a second messenger in signalling is common to Msn2 oscillations and to light-induced entrainment of circadian rhythms and suggests conserved roles for peroxiredoxins in endogenous rhythms.

Original languageEnglish
Article number14791
JournalNature Communications
Volume8
DOIs
StatePublished - 24 Mar 2017
Externally publishedYes

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